EP1198881B1 - Filtre a ondes acoustiques de surface - Google Patents

Filtre a ondes acoustiques de surface Download PDF

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Publication number
EP1198881B1
EP1198881B1 EP00951200A EP00951200A EP1198881B1 EP 1198881 B1 EP1198881 B1 EP 1198881B1 EP 00951200 A EP00951200 A EP 00951200A EP 00951200 A EP00951200 A EP 00951200A EP 1198881 B1 EP1198881 B1 EP 1198881B1
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EP
European Patent Office
Prior art keywords
tine
surface acoustic
acoustic wave
wave filter
tines
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00951200A
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German (de)
English (en)
Other versions
EP1198881A1 (fr
Inventor
Günter Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tele Filter Zweigniederlassung der Dover Germany GmbH
Original Assignee
Tele Filter Zweigniederlassung der Dover Germany GmbH
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Filing date
Publication date
Priority claimed from DE19943072A external-priority patent/DE19943072B4/de
Application filed by Tele Filter Zweigniederlassung der Dover Germany GmbH filed Critical Tele Filter Zweigniederlassung der Dover Germany GmbH
Publication of EP1198881A1 publication Critical patent/EP1198881A1/fr
Application granted granted Critical
Publication of EP1198881B1 publication Critical patent/EP1198881B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/14564—Shifted fingers transducers
    • H03H9/14567—Stepped-fan shaped transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/14547—Fan shaped; Tilted; Shifted; Slanted; Tapered; Arched; Stepped finger transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/14564—Shifted fingers transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves

Definitions

  • the invention relates to the field Electrical / Electronics. Objects where application is possible and is expedient, components based on acoustic Surface waves like broadband bandpass filters and Verzog réelles effeten.
  • transducers for surface acoustic waves known those on a piezoelectric substrate two interdigital Distributed acoustic reflection transducers that come from Tine groups are composed, are arranged.
  • Tine groups composed of two or three tines consist.
  • two of these tines form a reflection-free one Tine pair, while the third tine each Reflector tine is.
  • the distance is typically between the center lines of the reflector tine and this Reflector tine adjacent tine of the pair of tines 3 ⁇ / 8 ( ⁇ is the longitudinal wavelength assigned to the center frequency a straight line parallel to the collecting electrodes in predetermined distance from one of these collecting electrodes.
  • a transducer structure of this type is a Single phase unidirectional converter Transducer, abbreviated: SPUDT).
  • SPUDT Single phase unidirectional converter Transducer
  • the execution [4] has the disadvantage that the bandwidth of this type of filter makes sense as close as possible of 1%. Broadband filter with low insertion loss can therefore not be realized.
  • the invention has for its object acoustic To change surface wave filters of the SPUDT type so that Broadband filter with low insertion loss and small Form factor without significantly increasing the layout can be produced.
  • the invention is based on a surface acoustic wave filter the SPUDT type, in which on a piezoelectric Substrate two transducers with distributed acoustic reflection are arranged, which consist of tine groups and collecting electrodes exist, the tines of the transducers one towards one the two collecting electrodes form a tapered structure, when along two parallel straight lines, all of them Cut the prongs of the transducer so that in each transducer along the lines all tine groups are of equal width the width of the tines and gaps between the two lines differs by a factor.
  • the structure which tapers according to the invention can be used as Parallel connection of a large number of narrow filter channels are viewed, the converters are only by their Period length and therefore by its center frequency differ. As a result of this rejuvenation of the structure therefore set a range of center frequencies that, determines the bandwidth at the same time. The greater the degree of Rejuvenation, the wider the range.
  • the Edge steepness, which determines the form factor, can, however are hardly influenced by the degree of rejuvenation, but is mainly due to the construction of the filter channels certainly.
  • the solution according to the invention offers the advantage this also applies to filters with a tapered structure to use to extend the impulse response as if everyone Filter channel and consequently the entire filter would have significantly more wave sources or, in other words, would be much longer than the current layout.
  • This The solution [1] does not offer any advantage because the echoes in each Filter channel are suppressed in that each converter channel in each filter channel for itself and consequently every converter as a whole through mutual compensation of reflection and Regeneration is reflectionless.
  • the invention can be expediently configured as follows.
  • the taper can be that the width of the Prongs and the gap between them gradually decreased.
  • each tine level a rectangular tine section with two each Direction of propagation vertical or parallel boundaries contains, the two parallel to the direction of propagation Limits of all tine sections of the same level each form a straight boundary line so that the between these two straight boundary lines lying tine areas represent filter channels through Intermediate areas are separated.
  • a tine group can contain two or three tines. in the the latter case can have two tines in a tine group form a pair of tines, the tines of a pair of tines equally wide and on different collecting electrodes are connected and arranged so that each other the pair of tines is reflectionless overall and each third prong is a reflector prong.
  • Particularly useful Refinements are when each tine group has a DART or EWC cell is.
  • Each tine group can have the source strength of the Amplitude excitation by a source strength function and a Reflection factor assigned by a reflection function be, with the source strength function and the Reflection function determined by an optimization process could be.
  • the reflection function can be such that the Reflection factor in at least one group of tines the other sign has the opposite sign Has. It is useful to change this sign realize that the distance of the reflector tine of said Tine group from the other reflector tines n ⁇ / 2 + ⁇ / 4 is, where ⁇ is assigned to the center frequency Wavelength is along a straight line that all prongs are like that cuts that in every transducer along that line all Tine groups are of equal width and n is an integer.
  • a particular source strength function is it is expedient if at least some tine groups, referred to as structured tine groups, at least a converter in parallel to the collecting electrodes in a number are divided by sub-converters that are electrically in series are switched. It is particularly useful if everyone Subconverters of the same structured tine group have the same aperture.
  • the number of sub-converters in at least one structured one Tine group can differ from one in the other differentiate structured tine groups.
  • the widths of the respective Tine pair of tines or the width of the Reflector tines in at least one group of tines in at least one a converter of those in the other tine groups distinguish or differentiate.
  • the invention is based on a Embodiment and an associated drawing closer explained.
  • the drawing shows an acoustic surface wave filter, which consists of two interdigital converters, which are on one piezoelectric substrate are arranged.
  • Tine groups 23, 24 and 25 are EWC cells. All tine groups 23, 24 and 25 are of the apart from the different average inclination of their tines, constructed identically. Therefore only the tine group 23 described in more detail. It is made of reflector tine 231 and tines 232 and 233, which together form a pair of tines, composed.
  • the converter 3 is composed of the collecting electrodes 31 and 32 as well composed of the tine groups 33, 34 and 35. This are representative of significantly more tine groups, from which the converter 3 consists of.
  • the prongs of the Converter 3 form a in the direction of the collecting electrode 32 tapered structure in the sense that the width the prongs and the gaps between them step by step reduced.
  • Tine groups 33, 34 and 35 are EWC cells. All tine groups 33, 34 and 35 are of the apart from the different average inclination of their tines, constructed identically. Therefore only the tine group 33 described in more detail. It is made of reflector tine 331 and the tines 332 and 333, which together form a pair of tines, composed.
  • the filter is made up of filter channels 201, 203, 205 and 207 composed. Between the adjacent filter channels 201 and 203, 203 and 205 as well as 205 and 207 are the Intermediate areas 202, 204 and 206, in which the Tine sections of adjacent filter channels leading to and belong to the same prong, are connected to each other.
  • the Gap 4 between transducers 2 and 3 is in these Filter channels represented by the spaces 41, 42, 43 and 44. All tine edges are parallel to each other. however are equivalent tine edges in different filter channels so shifted against each other that the intersection points 208 of the left edges of equivalent sections of one and the same prong with the lower boundary line of the respective filter channel straight on one and the same in different filter channels Line.
  • the straight lines 210 and 310 are inclined so that whose straight extensions 26 and 36 over the respective tine area in one and the same point 5 to cut.
  • the straight lines 210 and 310 are inclined so that whose straight extensions 26 and 36 over the respective tine area in one and the same point 5 to cut.
  • the equivalent tines differ Gap widths but also the spaces 46 and 47 between both transducers only by one and the same factor. Therefore differ in arbitrarily selected Filter channels not only equivalent tine and gap widths but also two of the spaces 41, 42, 43 and 44 between both transducers that go to the selected one Filter channels only belong to one and the same factor.
  • This Property guarantees that the transmission properties (e.g.
  • the reflection factor of some Tine groups have one compared to the other tine groups, opposite sign. This is realized in that the distance of the reflector tines in the affected tine groups from the other reflector tines n ⁇ / 2 + ⁇ / 4, where n is an integer.
  • the Reflector tines of the tine groups 23, 24 and 25 shown and 33, 34 and 35 have distances equal to n ⁇ from each other. However, if the reflection factor of one of these tine groups would be negative, the reflection prong would have to be this Tine group in relation to their position in the drawing 3 / 4 ⁇ , 5 / 4 ⁇ or 7 / 4 ⁇ to be shifted.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Claims (19)

  1. Filtre à ondes de surface acoustiques, basé sur des convertisseurs unidirectionnels monophasés interdigitaux (Single Phase Unidirectional Transducer / SPUDT /), avec lequel deux convertisseurs (2 ; 3) de ce type à réflexion acoustique distribuée sont disposés sur un substrat piézoélectrique (1), lesquels se composent de groupes de dents (23-25 ; 33-35) et d'électrodes collectrices (21 ; 22 ; 31 ; 32), les dents des convertisseurs formant une structure qui se rétrécit en direction de l'une des deux électrodes collectrices, avec lequel le long de deux lignes droites parallèles (6 ; 7), qui croisent toutes les dents des convertisseurs (2 ; 3) de manière à ce que tous les groupes de dents (23-25 ; 33-35) sont de la même largeur le long des lignes (6 ; 7) dans chaque convertisseur (2 ; 3), la largeur des dents (231-233 ; 331-333) et les espaces entre celles-ci se différencient d'un facteur donné entre les deux lignes (6 ; 7), caractérisé en ce que l'espace intermédiaire (46 ; 47) entre les deux convertisseurs (2 ; 3) se différencie lui aussi du facteur donné entre les deux lignes (6 ; 7) de manière à ce que les prolongations rectilignes (26 ; 36) des dents (231-233 ; 331-333) des deux convertisseurs (2 ; 3) se croisent au-delà de la zone des dents en un seul et même point (5).
  2. Filtre à ondes de surface acoustiques selon la revendication 1, caractérisé en ce que dans le cas de la structure qui se rétrécit, la largeur des dents (231-233 ; 331-333) et des espaces entre celles-ci se réduit graduellement.
  3. Filtre à ondes de surface acoustiques selon la revendication 2, caractérisé en ce que tous les coins (208 ; 209) d'une seule et même arête de dent se trouvent sur une courbe, les prolongations rectilignes (26 ; 36) de toutes ces courbes des deux convertisseurs (2 ; 3) se croisant au-delà de la zone des dents en un seul et même point (5).
  4. Filtre à ondes de surface acoustiques selon la revendication 3, caractérisé en ce que chaque étage de dent comprend une section de dent rectangulaire avec à chaque fois deux délimitations perpendiculaires ou parallèles par rapport au sens de l'élargissement, les deux délimitations parallèles au sens de l'élargissement de toutes les sections de dent du même étage formant à chaque fois une ligne de délimitation droite de manière à ce que les zones de dents qui se trouvent à chaque fois entre ces deux lignes de délimitation droites forment des canaux filtrants (201 ; 203 ; 205 ; 207) qui sont séparés les uns des autres par des zones intermédiaires (202 ; 204 ; 206).
  5. Filtre à ondes de surface acoustiques selon la revendication 3, caractérisé en ce que toutes les courbes sont des lignes droites (210 ; 310).
  6. Filtre à ondes de surface acoustiques selon la revendication 1, caractérisé en ce que chaque groupe de dents (23-25 ; 33-35) des deux convertisseurs (2 ; 3) comprend deux dents.
  7. Filtre à ondes de surface acoustiques selon la revendication 1, caractérisé en ce que chaque groupe de dents (23-25 ; 33-35) des deux convertisseurs (2 ; 3) comprend trois dents.
  8. Filtre à ondes de surface acoustiques selon la revendication 7, caractérisé en ce que deux dents (232 ; 233 ou 332 ; 333) d'un groupe de dents (23-25 ; 33-35) forment à chaque fois une paire de dents, les dents d'une paire de dents étant de la même largeur et étant raccordées à des électrodes collectrices (21 ; 22 ou 31 ; 32) différentes et étant disposées l'une par rapport à l'autre de telle manière que la paire de dent ne présente globalement aucune réflexion et la troisième dent (231 ou 331) est à chaque fois une dent de réflexion.
  9. Filtre à ondes de surface acoustiques selon la revendication 8, caractérisé en ce que chaque groupe de dents (23-25 ; 33-35) est une cellule DART.
  10. Filtre à ondes de surface acoustiques selon la revendication 8, caractérisé en ce que chaque groupe de dents (23-25 ; 33-35) est une cellule EWC.
  11. Filtre à ondes de surface acoustiques selon la revendication 8, caractérisé en ce que l'intensité de source d'excitation d'amplitude est affectée à chaque groupe de dents (23-25 ; 33-35) par une fonction d'intensités de source.
  12. Filtre à ondes de surface acoustiques selon la revendication 8, caractérisé en ce qu'un facteur de réflexion est affecté à chaque groupe de dents (23-25 ; 33-35) par une fonction de réflexion.
  13. Filtre à ondes de surface acoustiques selon la revendication 12, caractérisé en ce que le facteur de réflexion présente le signe opposé dans au moins un groupe de dents (23-25 ; 33-35) par rapport à l'autre groupe de dents, ce qui est réalisé par le fait que l'écart entre les dents de réflexion (231 ; 331) dudit groupe de dents et les autres dents de réflexion est de nλ/2 + λ/4, λ, étant la longueur d'onde affectée à la fréquence centrale le long d'une ligne droite (6 ; 7) qui croise toutes les dents de manière à ce que dans chaque convertisseur (2 ; 3), tous les groupes de dents (23-25 ; 33-35) présentent la même largeur le long de cette ligne et n est un nombre entier.
  14. Filtre à ondes de surface acoustiques selon la revendication 11 ou 12, caractérisé en ce que la fonction d'intensités de source et la fonction de réflexion sont déterminées par un procédé d'optimisation.
  15. Filtre à ondes de surface acoustiques selon la revendication 11, caractérisé en ce qu'au moins quelques groupes de dents (23-25 ; 33-35), désignés sous le nom de groupes de dents structurés, sont divisés dans au moins un convertisseur parallèlement aux électrodes collectrices en un nombre donné de sous-convertisseurs qui sont branchés en série.
  16. Filtre à ondes de surface acoustiques selon la revendication 15, caractérisé en ce que tous les sous-convertisseurs d'un seul et même groupe de dents structuré ont la même ouverture.
  17. Filtre à ondes de surface acoustiques selon la revendication 15, caractérisé en ce que le nombre de sous-convertisseurs dans au moins un groupe de dents structuré est différent de celui dans les autres groupes de dents structurés.
  18. Filtre à ondes de surface acoustiques selon la revendication 8, caractérisé en ce que les largeurs des dents (232 ; 233) faisant partie de la paire de dents correspondante dans au moins un groupe de dents (23-25 ; 33-35) dans au moins un convertisseur (2 ; 3) sont différentes de celles dans les autres groupes de dents.
  19. Filtre à ondes de surface acoustiques selon la revendication 8, caractérisé en ce que la largeur de la dent de réflexion (231 ; 331) dans au moins un groupe de dents (23-25 ; 33-35) dans au moins un convertisseur (2 ; 3) est différente de celle dans les autres groupes de dents.
EP00951200A 1999-06-03 2000-05-31 Filtre a ondes acoustiques de surface Expired - Lifetime EP1198881B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19925798 1999-06-03
DE19925798 1999-06-03
DE19943072A DE19943072B4 (de) 1999-06-03 1999-09-06 Akustisches Oberflächenwellenfilter
DE19943072 1999-09-06
PCT/DE2000/001808 WO2000076065A1 (fr) 1999-06-03 2000-05-31 Filtre a ondes acoustiques de surface

Publications (2)

Publication Number Publication Date
EP1198881A1 EP1198881A1 (fr) 2002-04-24
EP1198881B1 true EP1198881B1 (fr) 2004-07-28

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EP00951200A Expired - Lifetime EP1198881B1 (fr) 1999-06-03 2000-05-31 Filtre a ondes acoustiques de surface

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US (1) US6707229B1 (fr)
EP (1) EP1198881B1 (fr)
JP (1) JP2003501934A (fr)
WO (1) WO2000076065A1 (fr)

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US6707229B1 (en) 2004-03-16
EP1198881A1 (fr) 2002-04-24
WO2000076065A1 (fr) 2000-12-14

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